Filter bed leveling or scraping means



March 19, 1946; ASC 2,396,769

FILTER BED LEVELING 0R SCRAPING MEANS Filed Feb. 14, 1942 5Sheets-Sheeti INVENTOR.

flflid? HTTORNE Y March 19; 1946. B. ASCH- FILTER BED'LEVELING ORSCRAPING MEANS I INVENTORQ a Shets-Sheet 2 Filed Feb. 14, 1942 gym/(amJ31 flscll/ March 19, 1946. A B; ASCH FILTER BED LEVELING on SCRAPINGMEANS Filed- Feb. 14, 1942 3 Sheets-Sheet 3 I INVENTOR.

imam .23. flat/1 arrow/v5) Patented Mar. 19, 1946 FILTER BED LEVELING QRSCRAPING MEANS Abraham B;.Asch, Jersey City. N. J assignor'to Charles-E.Fraser, New'YorlnN. Y.

ApnlicationyEebruary-l, 1942,. Serial No; 430,898:

13,. Claims.

The presentzinventiorr.relates=to .meanstadaptedi tobe; used; forsmoothing. or. leveling a filter bed afteriit'hasbeensubiectedi to acleaning operation.

In. connection with. thev treatment of drinkingwater, sewage;iHdHSlFIiELILDIZOCESS liquids and'other manufacturing;operations,.it;isfrequently desir able to pass liquids; through; abedof sand'or someother suitablezmaterialto filter or: strain out.

suspended. solid matter. After a filter bed. has been in-useforai-period of: time the Sandor other material comprisingthebedbecomeschoked with matter,rem oved;from theinfluent; This chokingup: of. the.filter bedlowers its efiiciency by. decreasing the rate; at. which;liquid. may pass. through the bed; When thiszcondition' occurred it wasformerly: the; practice; to; shut. off. the. in1- fluent, andbackwash-sit'or strip off. the upper'layer of; the filter bed-material.andrepl'ace itwith clean filter bedv material. This was. costly.andrinefiicient for it involved shutting: down a. filter. bed completelywhile the filterwvas being cleaned and made-ready for furtheruse.

'Io,overcome..the aboyedisadvantages mechanicalmeans have been. devisedfor cleaninga filter' bed while the bedfremains; in. operation. These.mechanical, means, inv general; agitate progressively portions-ofthefilterbed material-.to loosen. accumulated particles of dirt,-sludge, and the. like from the filter -bed1materia-l:and1cause theloosened' impurities: to pass. into. a. collecting tank; fromwhich they;may bez-removed' by a. pump.

Qne diificulty experienced with; such; mechanicalcleaning means isthatfrequently the agitated and; cleaned filterrbedi material is;washed. about.

considerably by; currents; oficleansing liquid and is not reformedintoa:layer'ofysubstantially uni.

form; thickness. after; passage of: the cleaner over thebed; Formaximumefiiciency the thickness of the. filter bed should;b.e uniform sothat'each area of the bed filters.- substantially the same.-

quantity of influent. Ifza-filter bedcontains both.

The presentinventiorr. aims-1 to overcome the above and, other;difficultiesby: providing anew.

and improved filter; bed smoothing: on leveling means adapted; to beutilized with. mechanical. filter bed cleaning devices.-.

An object of. the present: invention-.isto:provide a new andimprovedfilterbedplevelingmeans.

Another. object; of; the: invention: is to: provide, a filter bedleveling: means: which is automatic-inoperation.

Another object of the: invention is. toprovide a filter bed levelingmeans having the operating; mechanism therefor exposed to viewandireadilys accessible at all times.

Another object of theainventionis' to provide a filter'bed levelingmeans. which is relatively simple in construction andoperation.

Other and. further objects oftheinventionawill; be. obvious uponanunderstanding; of theillus,-

trativc embodiment about tosbe described, or; will be indicated inthe-appended claims; and various.

advantages not. referred to-herein:wi1l occur to;

one skilled inthe art: upon employment. of theinvention in practice Apreferred. embodiment of the invention, has; beenchosenrfor: purposesofi illustration and dc:- scription and-is shown intheaccompanying drawings, forming. a partof thespecification, wherein Fig. 1 isasideview;partly broken away; illustrating a preferred embodimentof-the-invention;

Fig.2 isa fragmentary endview, partly in sec;- tion, showing ascraperrinraisedposition;

Fig. 3. is a fragmentary end view, partly in sec-- tion, showingascraper in loweredposition;

Fig. 4. is a. fragmentary view-taken. along the: 1ine.4- l of Fig.1;

Fig. 5 is, a. fragmentary 2 View taken along theline,55 ovfFigdl Fig. 6is a fragmentary sideviewof. a preferred. form ofscraper lowering means;and

Fig. '7 is a fragmentary perspective viewof-a preferred form ofpush barvsupporting means.

Referring againv to thedrawings, thereisshown 4 a filter tank I having afilter bed, 2 located-adiae cent the lower part thereof. The filter bedzmay be. ofv sander other suitable, material placed in desired thicknessover a. supportingscreenEi-and grid 1.. While; any suitable thicknessoffilterbed. material may be utilized, it hasbeenfound that a thicknessof.from'three to six inches gives good results in. actual, operation.Dirty liquid or infiuent enters-the tank I at, a-point: locatedabovethefilter. bed 2 and passes.througlrthebed into. a.lowercompartmentfir. Passage through the bed 2 removes solid matter from theinfiuent.

From the compartment 8 the liquid passes through suitable dischargepassages (not shown) to the next treatment step, if such is desirable ornecessary. Since the path of the infiuent through the filter bed isdownwardly, this type of filter is commonly referred to as a downflowfilter. While the present invention will be described chieflywithreference to a downflow type of filter, the principles thereof areequally applicable to filters of the upflow type in which the path ofthe infiuent is upwardly through a filter bed. Also, the presentinvention will be described chiefly with reference to its use withfilter tanks and beds which are rectangular in shape,

but it is to be understood that the principles thereof are equallyapplicable to filter tanks and beds which are circular in shape.

Trackways HI located on top of the side walls of the filter tank I areadapted to support and guide the wheels ll of a carriage or trolley I3which supports the cleaner mechanism l4 and also the scraping orleveling mechanism of the present invention. The carriage l3 may beformed from suitable structural steel channel or angle irons and isadapted to travel progressively, with the cleaning and scrapingmechanisms, over the filter bed during cleaning operations. That is,theentire area of a filter bed is not cleaned at one time but a portionthereof located beneath the cleaning means I4 is cleaned during movementof the cleaning device along the length of the filter bed. Thoseportions: of the bed not being subjected to a cleaning operation remaineffective to filter the influent.

Various types and modified forms of cleaning devices may be utilized andPatent No. 2,204,534 granted to Charles E. Fraser on June 11, 1940, isillustrative of one of them. The operation of this patent depends uponcreating a localized reduction in the resistance or back-pressure of thefilter to the passage of water therethrough, at an area where amagnetite sand filter bed is agitated by an electromagnet, and theinrush of water through this area in amounts suflicient to washimpurities from the magnetite during its agitation. The rise of washwater or eflluent through the area of lessened resistance is caused bythe is alternately magnetized and demagnetized so that a narrow strip ofmagnetic sand is alternately jerked off the screen and allowed to fallback again. The operation of a centrifugal pump I! lowers the level ofwater inside the caisson and effects an upward flow of liquid throughthe agitated strip of sand. The induced upward flow of liquid throughthe sand separates the grains of sand and impurities and carries thelatter into the pump chamber l 9, from which they are removed by thepump I], j

Leakage ofwater into thecaisson from the ends thereof is minimized byproviding it with rotary sealing drums 20 having cleats 22 which peneetrate a short distance into the sand of the filter bed. The drums-20rest on the surface of the filter bed and make a rolling contacttherewith as the cleaner caisson moves back and forth over thefilterbed. The side walls 23 of the cleaner caisson are preferablyprovided with plate members 25'that form a sliding contact with theupwardly projecting flanges 26 of angle members that extend along thelength of a filter bed at the sides thereof. The cleaner mechanismdescribed immediately above is similar to that disclosed in FraserPatent No. 2,204,534. Other types of cleaning mechanisms may beutilized, the above described cleaner being shown as illustrative of onetype which has proven satisfactory with the present'leveling or scrapingdevice.

With cleaning mechanisms of the above described type it is frequentlyfound that the sand comprising the filter bed is washed about by theaction of the cleaner so that it does not fall back into a layer ofsubstantially uniform thickness. It is therefore desirable that means heprovided to insure the removal of hills and valleys from the filter bedlayer to form a layer of substantially uniform thickness.

In the present instance the smoothing or leveling of a filter bed isachieved by means of a plurality of intermittently operable scrapers.The intermittently operable feature facilitates operation of a scraperat the rear of the cleaning mechanism, regardless of the direction ofmovement of the cleaning mechanism over the filter bed. The scrapermechanism comprises a pair of scraper carrying arms 28 pivotally mountedadjacent their mid-points on bearings 30 at opposite sides of thecleaner supporting framework 3!. The scraper carrying arms 28 arepreferably balanced on the bearings 30 so that they may be moved easilyabout the hearings in response to a scraper operating mechanism whichwill be hereinafter described. The undersides of the scraper carryingarms 28 may be provided with recesses.

32 and stop members 34 adapted to fit over projections 35 secured to thecleaner supporting framework and thereby prevent excessive downwardmovement of the ends of the balanced arms 28. The spaced depending arms31, which are located at corresponding ends of the scraper carrying arms28, are adapted to support between them, at their lower ends, scrapers38. Bracing members Ml, connected adjacent their lower ends to thedepending scraper arms 31 by a welded plate member 4! and to the balancemember 28 adjacent their upper ends by bolts 43, may be provided toassist in maintaining the depending arms 3'! in desired position.Vertical adjustment of the depending supporting arms 3! may befacilitated by providing each of the arms 31 with outwardl extendingapertured brackets 44 and the balanced arms 28 with outwardly extendingapertured brackets 46, adapted to receive bolts 41 and adjusting nuts48. Screwing the nuts 48 together or apart "an appropriate amountadjusts the heights of the vertical arms 31 and of the scrapers 38secured thereto with respect to the surface of the filter bed 2. Afterbeing adjusted to a desired position the bolts 45 extending through theslots 39 in the balance arms may be maintained tightly in position bynuts 42 to hold the arms 31 against accidental change in verticalposition. This assists adjusting the heights of the scrapers and inmaintaining a filter bed layer of proper thickness.

The scrapers 38 may be mounted on plates 51 welded to the lower ends ofthe depending arms 3'! and preferably comprise transverse walls 33 andwings or side walls 36 located at each side of the transverse wall 33.Providing th plates 51 with vertical slots 68 and the transverse scraperwall with horizontal slots 63 facilitates connection and adjustment ofthese parts by adjusting the bolts andmutszil Thetransversewallthextendssnbe stantially entirely acrossathe; width. of the filtenbedlandis preferably-providedzwith ,a: brace stormed from .ananglemember1-49 welded, bolted ,orother wise: secured.- t=the= back thereof.Th brace wr minimizes. bending on bowing rearwardly of the transversewalls: 33.- during; scraping; or leveling; operations. The; sideswallson wings: 36 minimize spreading or spilling. of sand around the ends oftheecrapers. Anysuitableheight maybe utilized forthe trans-verse. andside wall portions ot the.- scraper- 38; but it has been foundrthat'eight inchesv is. satisfactory in actual. practice. The scrapersana-adaptedtobe selectively operated-by mocha,

nismwhich will.- be. hereinafter described so that onlya. trailingscraperrwill be effective upon the; filter, bed 2 at anyonetimeaThat.is;,.the only.- scraper efiective upon a filter bed-at anyonetimeis the; scraper.- which. trails: behind the-cleaning mechanismsothatitmay smoothhr. level .theebett after agitationby the; cleaningmechanism.

The mechanism; for; selectively operating the. scrapers:- 38is;preferab1y carried. by the cleaner carriageor trolley l3.. Eventhoughzthe scraper carrying armsZB are-joined together throughthescrapers. 33. a separate. mechanism is: preferably utilizedateachside -of-.the carriage. I3 for, operating the scraper carrying. armlocated atthe cor-- responding. side of. the carriage. Since thesemechanisms are the samein construction and.op.- erationa description of.the, mechanism: at. one. side oflthe scraper will'sufii'ceiorbothlLinksfifl arelocated adjacent. eachend of. the carriage l3 and. aresecuredtorrods- 52 pivotally mounted. in, spaced bearings 5.31. Mountinthe rods. EZ'in spacedbearingsholds the links 5!).- accurately inposition. Thelower or. oppositeends of. the links, 59' are connectediby.boltsandnuts 5. with rollers 55'andpush bar brackets. 56.. The twopushbar bracketslocatediat each side. of the. carriage, are,

in turn connectedby a pushbar. 58. By-reason of" the. pivotalconnections adjacent, the upper. and

lower ends of'the links 593 the push bars 58 may be. movedlongitudinally with respect't'o thedirection of'movement of the carriagel3: and.. the. cleaner. 14'. The links 5llare preferably sopositionedlwith. respect to the push. bar 58 that if'the push, bar wereallowed to hang; freely each of the. links would lie at an acute angleto the. push bar. That is, the spacing ofthe push barbracketsfiliiandthe. lower ends of" the links. on the pushbar is,greater than the, distance between the rods 52 upon-whicharem-ount'edthe upper ends of the links 59. This'constructionfacilitates movement in a vertical direction ofthe push bar brackets55and rollers 55 upon longitudinal movement of'the. push bar. When alink5!! is in vertical position, as illustrated'at the rightof the carriageI3. in. Fig. land in Figs. 3and 6, the correspondin push bar bracket androller will be" located" inlowermost or depressed position; .When, alink. 50 at the right Oflihe carriage I3 isso positioned that thecorresponding-roller'is in lowermost position. the-lower end of the link50 and itscorresponding roller at the left ofthe carriage l3 will havebeen moved" outwardly or to the left; in' this position the roller at"the left will have been moved'verticallyto its uppermost position.

Longitudinal movement of a push bar to. the right onto the left-thusmoves the rollers.5.5 vertically and thelatter are effective to move thescraper carrying arm- 28 and selectively operate. thescrapers 38.Downward movement of the it tomove into contactwith aca 59 locatedon.

theflpperzsuriaceaofi the-pivotallwmountedscranen carryingjarmzztianditoipress: the right-side orthez I scraper: carrying: arm;downwardly-;.. Downwardz movementofrtheright:sideaotthe=scrapercarrying7 arm; causes thesoraper atthewlower part: of the I located atthe-leftbr frontiend ,oi the cleanercarriage will ,be-iin uppermost or ineffective-position; i. e., outof.contactwithi the cam atthat end-on thebalancedarm.v As the carriage: andcleaner; approach:- theend, of their path. of. travel toward theleft,the endrof. a.-push1bar; moves into. con

right sidev ofthebalanced arm 28 and.the' scraper.

atthe rightto move upwardly away from thesurface of the filter bed,2l

The push bars 58 are preferably main.tained,in,-'v position by means ofpushbar springs 6.4. (Figs 1 and-7i which havebearin'gportions 65adaptedit'o. press'firmly upwardly against the underside of the; pushbars" 58 at. all'times. The push bar. springs,

may be bolted to thebalance armbearings 3,0. and/ prevent-the pushbarsand links ,from accidentally shifting their positions and thus allowingthe. rollers to, move off the cams. which would prefvent-proper-operation of the scrapers.

The amount of' vertical movement of the bal armed p ms 28 andthescrapers may, be adjusted'by changing the, height of the cams 59 shims62 have been shownprovided' beneath the cams 'for-faoilitating'this'adjustment;

In operation the carriage; cleane and scraper mechanisms travel to andfro over the filter bed; In Fig. 1 these mechanisms are illustrated asmoving toward the-left. When the carriage and cleaner approach the leftend of the tank a" bumpertil moves the push bar toward the right tolower the left end scraperand raise the rightend scraper. A reversingtrip and reversing switch (notshowni also become effective to causethecarriage l3'- and, cleane to automaticallyreverse their direction ofmovement and'move to ward theright over the filter bed. When thecarriage and cleaner approach the opposite end" of the filter tank thepush bar 58 is again pressed toward the left by a stop o bumper (notshown). the-carriage'and' cleaner reverse their directionof movement,and the action is repeated. Movementv of; the, carriage and cleaner fromone encl of aarectangular: filtration tank: and bed't'o theother: end.thereof; is automatic and continuous as long; as current is. supplied:to; a; driving motor 68; thismay be controlled-home master'swit'clr atacentral location; Itis notnece-ssary that-the cleaner be operated atall; times but: only when the amount (if-"solidi matter accumulated. bythe filter'bed renders it advisabletoiclean theabedl While the, scrapemechanism is; particularlyuseful in, connection with: rectangular: hapedfilterntanks. it is, also. usefulas: applied, to. filter, tanks, of,circulan shape.

With: sushi. tanks; it: is

der to repair only a part of the tank. With the present scraping deviceit i possible to block oif and repair part of the circular tank and tocause the cleaner and scraper to travel back and forth over the otherportions of the tank without shutting it down completely.

It will be seen that the present invention provides a new and improvedfilter bed leveling mean which is automatic in operation. The scrapingor leveling means travels behind the cleaning means and effectivelyremoves hills or valleys to provide a bed of substantially uniformthickness, whereby maximum filtering efliciency is achieved. of sandwhich is already in position on a screen and grid, the present scrapingmechanism is useful for leveling oil a layer of nev sand that may beplaced on the old bed to replenish losses which have occurred. Themechanism for alternately raising and lowering appropriat portions ofthe leveling or scraping means is mounted on the carriage above thecleaning means Where it is exposed to view and may be readily inspectedor repaired without shutting off the filter and draining the liquidtherefrom. The majority of parts and members utilized in theconstruction may 'be made from ordinary structural steel. The operatingmeans is simple in construction and readily able to withstand any roughusage to which it may be subjected.

As various changes may be made in the form, construction and arrangementof the parts herein without departing from the scope and spirit of theinvention and without sacrificing any of its advantages, it is to beunderstood that all matter herein is to be interpreted as illustrativeand not in a limiting sense.

Having thus described my invention, I claim:

1. A device of the class described comprising, in combination a carriageadapted to travel back and forth over a filter bed, mean carried by saidcarriage and movable with respect thereto for cleaning said filter bed,a member operatively connected with said carriagehaving filter bedscraping means attached thereto at the front of said cleaning means, andmeans including a plurality of links pivotally connected to saidcarriage at their upper ends, andlocated above the cleaning meansadapted to engage said member with their lower ends to selectively raiseand lower said filter bed scraping means.

2. A device of the class described comprising, in combination, acarriage adapted to travel back and forth over a filter bed, meanscarried by said carriage for cleaning the filter bed, a pivotallymounted member movable with said carriage and extending beyond the frontand rear of the cleaning means, filter bed leveling means rigidlyattached to said member on opposite sides of the pivot and at the frontand rear of the cleaning means, and mechanism for oscillating saidpivotally mounted membe comprising a frame and means'including aplurality of links pivotally mounted at their upper ends to the carriagefor mounting said frame on said carriage to permit said frame to movelongitudinally with respect to said carriage and to tilt with respect tosaid carriage into engagement with said membe;- to move on of saidleveling means toward the operative position and the other of saidleveling means away from operative position.

3. A device of the class described comprising, in combination, acarriage adapted to travel on In addition to leveling out a bed itspivot to raise the scraping-and leveling means i in the front andsimultaneously to lower the scraping means in the rear, and means formovingsaid frame into engagement with said elongated member to effectsaid raising and lowering as the carriage approaches the end of itsmovement in one direction.

4. A device of the class described comprising, in combination, acarriage adapted to travel back and forth over a filter bed, meanscarried by said carriage for cleaning the filter bed, a pivotallymounted member movable with said carriage, and extending beyond thefront and rear of the cleaning means, filter bed leveling means rigidlyattached to said member on opposite sides of the pivot and at the frontand rear of the cleaning means, and mechanism for oscillating saidpivotally mounted member comprising. a frame and means for mounting saidframe on said carriage in operative relation with respectv to saidpivoted member to, permit said frame to move longitudinally with respectto said carriage upon engagement with a stop elementand to tilt withrespect to said carriage into engagement with said member to move one ofsaid leveling means toward operative position and the other of saidleveling means away from operative position.

5. A device of the class described comprising, in combination, acarriage adapted to travel over a filter bed, means carried by saidcarriage for cleaning said filter bed, a member pivotally mounted onsaid carriage having filter bed scraping means attached thereto at thefront and rear of the cleaning means and means including a plurality ofarms pivotally connected at one end to said carriage and with theirother ends movable into engagement with said member to selectively raisethe filter bed scraping means at one end of said member andsimultaneously lower the scraping means at the other end.

6. A device of the class described comprising, in combination, acarriage adapted to travel over a filter bed, means carried by saidcarriage for cleaning said filter bed, a member pivotally connected withsaid carriage with ends extending longitudinally thereof, filter bedscraping means operatively attached to the respective ends of saidmember, a plurality of links pivotal y connected at one end with saidcarriage, a member for joining said links together, means carried bysaid links at their other ends to engage said pivotal member when saidlinks are moved about their pivots, to tilt said pivoted member, andmeans for moving said oining member to move said links about theirpivots to tilt said pivoted member and selectively raise the filter bedscraping mean at one end and simultaneously lower being at an angle withrespect to each other to cause said member to tilt when the links swingabout their carriage pivots, a pivotall mounted arm carried by saidcarriage and filter bed scraping means operatively connected to therespective ends of said arm, and means for moving said link connectingmember to move said links into operative relation with respect to saidarm and to move said arm about its pivot to raise the filter bedscraping means at one end of the carriage and to lower the filter bedscraping means at the other end.

8. A device of the class described comprising, in combination, acarriage adapted to travel over a filter bed, filter bed cleaning meanscarried by said carriage, a member extending longitudinally of thecleaner pivoted at its middle to said clean er, a pair of scrapersextending across substantially the entire width of said filter bed, oneof said scrapers being mounted at one end of said pivoted member andanother being mounted at the other end thereof, and means including asecond elongated member swingingly mounted on said carriage for engagingsaid first member and for tilting said first member about its pivot to Iraise one of said scrapers and to lower the other.

9. A device of the class described comprising, in combination, acarriage adapted to travel over a filter bed, filter bed cleaning meanscarried by said carriage, a longitudinal member pivotally mounted onsaid cleaning means, a pair of scrapers attached to said member andextending across substantially the entire width of said filter bed aheadof and behind the cleaning means, and means, including a plurality oflinks pivoted at their upper ends to said carriage for engaging saidmember at their other ends, for engaging and moving said member aboutits pivot for raising one of said scrapers out of contact with thefilter bed and lowering the other into contact with the filter bed.

10. A device of the class described comprising, in combination, acarriage adapted to travel over a filter bed, filter bed cleaning meanscarried by said carriage, a member pivotally mounted with respect tosaid carriage having ends extending toward the front and rear of thecarriage, scraper supporting arms adjustably secured to the respectiveends of said member and having scrapers adjacent the lower ends thereof,and means including an elongated member and a plurality of pivotedlinks, pivotally connected to the carriage at their upper ends andattached to said elongated member at .their lower ends, for engagingsaid pivotally mounted member and for engaging and moving said pivotallymounted member about its pivot to raise one scraper out of contact withthe filter bed and to lower the other into contact with the filter bed.

11. In a device of the class described, the combination of a carriageadapted to travel over a filter bed, filter bed cleaning means carriedby said carriage, a pair of members pivoted at their middle to saidcarriage, scraping means secured to the ends of said members, aplurality of links pivotally connected at one end to said carriage toengage and actuate said pivoted members with their other ends, means forretaining said links at an angle to each other and for moving said linksabout their pivots to engage and move said pivoted members about theirpivots, to raise one scraper out of contact with the filter bed and tolower the other into contact with the filter bed and means forreleasably locking said links in position to retain one of said scrapersin effective position.

12. In a device of the class described, the combination of a carriageadapted to travel over a filter bed, a filter bed cleaning means carriedby said carriage, a pair of members pivoted at their middle to saidcarriage and movable with said carriage and cleaning means, said membersbeing adapted to tilt into alternate positions about said pivot,scraping means secured to the respective ends of said members, camsurfaces operatively connected with said members, links pivotallyconnected to said carriage, means for retaining said links at an angleto each other and moving said links about their pivots and meansoperatively connected to said links for engaging said cam surfaces totilt said pivoted members about their pivots into alternate tiltedpositions and means to hold said pivoted members in said alternatetilted positions whereby one scraper is held in raised position and theother in lowered position.

13. In a device of the class described, the combination of a carriageadapted to move over a filter bed, a filter bed cleaner carried by saidcarriage, a frame pivotally mounted at its middle on said carriage andhaving scraping means at its ends, a swinging frame pivotally suspendedfrom the carriage for engaging said first frame and tilting it about itspivot means for swinging said swinging frame to engage and tilt saidfirst frame, and means for locking said first frame in tilted position.

ABRAHAM 1B. ASCH.

